1. On making a high kV exposure, a fault signal occurs, together with a light film.You suspect the tube may be unstable. To improve the X-ray tube stability you should.
a) Perform three 70kV 200mAs exposures to warm up the anode each morning.
b) Place the tube in extended preparation for a period of ten seconds before exposing.
c) Make a series of 20mAs exposures, starting at 70kV and increasing at 5kV per step, up to the required kV.
2. A line-pair gauge is used to:
a) Test the resolution of a TV imaging system.
b) Measure the number of grid lines for an X-ray grid.
c) Measure the conversion efficiency of an image intensifier.
